Constants
UITableViewCellSeparatorStyleNone
The separator cell has no distinct style.
UITableViewCellSeparatorStyleSingleLine
The separator cell has a single line running across its width. This is the default value
UITableViewCellSeparatorStyleSingleLineEtched
The separator cell has double lines running across its width, giving it an etched look. This style is currently only supported for grouped-style table views.

Discussion of [UITableViewCell UITableViewCellSeparatorStyleSingleLine]
You use these constants to set the value of the separatorStyle property defined by UITableView.